door to a different line of defense. >> i'm not sure that's a crime, colluding about russians. you start analyzing the crime. the hacking is the crime. the hacking is the crime. >> that certainly is the original -- >> the president didn't hack. >> reporter: giuliani also pushing back on allegations that then candidate trump knew in advance and approved his campaign's 2016 trump tower meeting with russians, promising dirt on hillary clinton. a claim sources tell cnn that mr. trump's former lawyer michael cohen is willing to tell special counsel robert mueller's investigators. >> we said there was a one-on-one meeting that donald jr. came in and told them about the meeting was about to take place. well, there are two witnesses who say it didn't happen. >> the president and his son. >> reporter: the president's lawyer also bringing up the possibility of another previously undisclosed meeting before then saying it did not happen either. >> there wasn't another meeting that has been leaked but hasn't been public yet. >> okay. >> that was an alleged meeting